condition mean min max ZT0-3 0.6981705 0.6981705 0.6981705 ZT4-7 0.38388449999999996 0.38388449999999996 0.38388449999999996 ZT8-11 0.3733225 0.3733225 0.3733225 ZT12-15 0.41913849999999997 0.41913849999999997 0.41913849999999997 ZT16-19 0.670674 0.670674 0.670674 ZT20-23 0.8296285 0.8296285 0.8296285